I like 3 x 2 mile somewhere between marathon and half in a 90 min run…come to think of it I haven’t don’t that in awhile.
Also like 2 x 20 mins at half mp with 5-8 mins float recovery around 8-830 pace.
If it’s any consolation my half and full pace are only like 15-20 seconds apart.
Your 10k looks a little slow compared to your 5k and mile so I’d think you need more time at around 10k-half pace.