Hi, it's virtually impossible to go straight into heavy bows.
As a bowyer I started making bows that were in the 40-70# range. I then got a commission for a 90# which I couldn't draw.
(A friend who was getting into warbows at the time could draw it). I persevered and got close to full draw.
As the warbow community became more established (the Mary Rose bows and Youtube videos being a big influence) people started to get a better appreciation for the technique needed to draw a heavy bow (it is nothing like the target archers "T" draw).
When I turned 60 I thought if I don't draw 100# (and shoot over 300yards) now, I never will, so I trained up (20 push ups night and morning plus other shoulder exercises).
I made an 100# Elm warbow (heat treated belly) and shot over 300 yards.
I'm somewhat older now and my left elbow gives me trouble, so about 60# is my limit.
You can enjoy the fun of a long draw and warbow style with lesser weight bows 70-80 shooting an 11/32" or 3/8" medieval lookalike arrow.
It's all about having fun doing what you fancy and finding like minded individuals with whom to enjoy it.
Here's one v short video showing how a T draw doesn't work for long/heavy draw.
https://www.youtube.com/watch?v=XWJd34g_fpIThere are lots of warbow related videos on my channel.And plenty elsewhere showing technique.
Here's my mate JT shooting one that I made.
https://www.youtube.com/watch?v=5mNWg68Eg1EDel