The problem is quite simple. At the moment, there is more work than workmen to do it. It has been that way for over a year.
We had an extension built in 2021. The first six months, with some COVID restraints still in place went like a doddle, our builder, could get all the tradesmen he wanted, then COVID sanctions ended, all the house building sites opened up - and who wanted to pidde around with little domestic jobs when they can get a contract with a builder to do whatever their trade is on 200 houses and have a year's assured work?
It took us six months to find a landscape gardener to ro do the garden, it included moving earth terracing as well as wall and patio bulding - and this was a contract worth many thousands of £s. DH laid a wood floor in one room becaue it looked we would have a year or more wait to get a professional.
We are currently trying to get quotes to get the outside of the house painted, again a big and valuable job, as the house is large and Listed. We are in the same position as the OP.
By the way, having lived in our house for 25 years, we have valued workmen, and we have tried them and 'word of mouth' either they are fully committed or talk about 6-9 month waits.