Hey there,
how would you periodize your year with no racing in mind (for personal reasons, no injuries etc)? I plan to race in 2026 so I can use this year just to build fitness and improve.
Currently I am in base (4th month) and plan to add 2 months of build in April afterwards - but then what until end of 2025?
Extend build?
Repeat Base / Build cycle?
Other ideas?
Building my plan by hand with the TR phases and no intend to use Custom Plan.
Thanks 
See how you feel as you approach the end of that 2 month build?
You might fancy a VO2 block for instance. You might not.
Take a look at your power curve and see if there is a particular time period range that you want to work on.
Generally, more decent base work is never the worst thing to do though.
If a goal is to help prepare for racing next year, I’d suggest you try to identify some weaknesses after you get through your build blocks. It can be challenging to identify weaknesses without real racing, but it’s still worth trying if you have other “race like” efforts. If MTB, do some solo TT efforts. If road, some hard group rides can highlight weaknesses. For road or gravel, I’d highly recommend Zwift if you are open to virtual racing. Obviously not the same as real life, but enough cross over to highlight areas to focus on.
If you are fairly new to training, I’d start over with base and go through it all again. If you have a lot of seasons in the legs, you can probably reduce base a bit. Either way, I’d suggest taking at least a couple easy/fun weeks off structured training before jumping back into a plan.