You can do what ever you want, just take it in small steps.
Get the gear. Slowly acquire the knowledge. But most important, *get out there*. Don't be an arm chair outdoorist or YouTube bushcrafter.
Slow & safe. Know your limits and push them in safe steps.
I'm planning long trips this year, the main goal being to walk the length of the North Downs which is very near to where I live.
I, like you, knew very little this time last year, but getting out there, getting the knowledge, getting the kit, *USING* the kit, and learning in fantastic communities like this give you knowledge needed to take on the larger goals.
Don't take the physical requirement for granted!
Go out and try a 10-15 mile hike on a well used trail for the day. You'll know where I'm coming from, the day after.
a 2 dayer
a 3 dayer
etc etc
Small, manageable steps!
Don't be a name on Sappers SAR forms!