I did the same only I was 120 kg.
I'm also was pretty good twenty years ago, duck jibing and in controll..
Now I'm fatter and older.( slightly lighter and working on it ),
Its kinda like riding a bike
I re started 5 years ago,
New gear is better but it's still hard work.
It is a awesome thing to get back into . Better than getting high , chasing fluff , and all that.
This is how I re done it.
Got an old $50 Wally on a sunny day and loved it.
Then bought a old big fat board with a modern 6.5 sail .
Thats it I was hooked .
I knew what I wanted next.
My advice , Go freeride 130 to 160 litre , 78 to 80 wide.( no wider ) , It will be sooo much better than what you remember . Beat the board instead of grow into it.
Once your into that you'll know what you want next

ps: sails are better and so much more fragile than what you remember .