And he is targeting 2019/20 to continue his improvement.
That is likely to mean more loans for the 22-year-old, who spent time at Hungerford Town, Kidderminster Harriers and Hednesford Town this campaign.
Blues have a healthy stock of goalkeepers.
Under the tutelage of Darryl Flahavan and Scott Bevan, he trains with Lee Camp, Connal Trueman, Adam Siviter and Michael Luyambula. With Zach Jeacock about to sign his first professional contract, competition is intense.
"When I get back for the start of the season I hope to push on again, probably look to get out on loan once more," said Weaver, who has signed a new one-year contract.
"It's getting that experience, which is the important thing. Then you never know where you can go from there."
About his recent loans, Weaver commented: "I think it has improved my game massively, along with the training.
"It is good to have an open mind (about going out on loan). Especially as a 'keeper and when you are quite young, it's all about developing yourself.
"Getting that exposure and playing games instead of getting set in that mindset of you're just training week after week - it gives that edge to train and prepare for something, to have a reward on a Saturday to look forward to."
Weaver made 13 appearances for Hungerford in National League South, from September to December.
"Hungerford was the first one. They are a good group of lads, I settled in very quickly. We had a few players going in there from Birmingham. Michael Luyambula took over when I left.
"We played some tough teams and particularly going down towards the bottom of the league, it was a case of being thrown into the deep end. I enjoyed it. You had to adjust.
"Kidderminster, I went in for a month. It is a big club, really well supported and good for that level.
"It just didn't work our there for me. That was unfortunate, but it's football. It's about overcoming obstacles if it isn't going your way.
"Hednesford was towards the end of the season. I needed to play some more games. They were in good form when I joined and it continued, which was nice to be part of."
Weaver, who also made seven appearances for the Under-23s, said the work done at the Trillion Trophy Training Centre, Wast Hills, was intense and illuminating.
"The coaching has been very good this year. Darryl Flahavan, Scott Bevan are very good coaches.
"They work on all aspects of your game, whether that's one v ones, crossing - all sorts. All-round, I think they have helped me a lot.
"It is all about having that relevance to matches. You can have that style of coaching where it's just catching balls.
"You want a challenge and you want to be able to see those pictures in training that you will be seeing in a match. So, as opposed to when something happens, it's not 'my God, what's this?'.
"That's what's coached into us, which we have all bought into.
"It's a really good group this year. There is a good mix of personalities and the underlying trait is that we all work hard.
"Then you kind of mix together well and push each other. We are driven on by Flavs and Scott."
Weaver began and ended the campaign on the bench for the First Team, at home to Norwich City and away at Reading.
"It was good. I kind of book ended the season, on the bench in the first and last game.
"It was nice, a great experience. When you are playing you get caught up in the moment. When you are on the bench, pitchside, you pick up a lot more. You watch people."