Communication is key. Whether you want to extend or not, or even if you don't know what you want to do yet, send a message to your landlord today and just tell them you are reviewing your options for the future now and still undecided (ie tell them the truth and no reason to withhold this). They will probably tell you to make a decision soon since they will need to re-advertise, renovate, maybe want to sell, etc.
Anyway maybe the rental price is part of your decision making so at least ask the landlord if they are willing to drop the rent if you extend? Doesnt this help in your decision making?
I am LL and thinking to sell my property in next 6 months. My tenants fixed contract expired last month, I told them already a few months before it expired that I am probably going to sell this year and cannot extend the contract long term, if they want to keep staying for now on month to month basis is fine, if they want to leave at end of contract is fine too. They chose to stay on month to month basis for now and either party can terminate at any time, but I have given them my word that if I do sell will give them a few months notice.