Terrible timing to buy a property

I've came to this sub for advice a few times in the past about my struggle with the rent vs buy dilemma. I finally decided to buy and it's funny how life happens... at the same time the market crashes, which I'm not overly concerned about because it will bounce, I found a new build property which fits my needs perfectly and it is much more affordable than I was expecting.

Unfortunately I missed the stamp duty relief, but I still have the FTB benefits. The thing that hurts the most is that to complete the purchase I will need to tap into my ISA and it is the worst possible time to do so.

Nevertheless, having a mortgage will reduce my monthly expenses with accommodation from £2700 pcm rent to about £2000 pcm mortgage.

What do you think? ISA lost about 5% so far, but this feels like saving money in the long run.

Numbers for those who like it: property is £460k, aiming at 85 LTV mortgage, so £69k deposit. They are offering me a garage for "free" to close the deal (£25k otherwise). ISA dropped value from £106k to £100k since Trump did his trumping. I do have £20k cash at hand to deal with stamp duty and others.

Thoughts?