Will try to keep it brief. I'm self employed (run my own craft business) and s single parent of a disabled primary age child and a teenager doing A levels. I claimed the first SEISS grant as all the events I usually sell at over the summer were cancelled.
However, I have managed to successfully build up the online side of my business over lockdown and sales are really good. I've just looked over my accounts for the first half of this tax year though and although business turnover is higher so far than at this point last year, my actual profit is down. This is a combination of factors, mostly Covid related.
Supply chains have been disrupted the costs of my materials have gone up, which means I'm paying out more for materials and also I'm bulk buying when I can get hold of things that are hard to find. I've introduced a couple of new ideas (subscription services) that have helped stabilise and hopefully future-proof my income to some extent, but these have involved significant extra outlay in bulk purchasing of materials to ensure I can fulfil orders even if supply chains are disrupted further (looking increasingly likely especially with no deal brexit on the cards
). I've also had to buy a dedicated work computer for managing online orders/spreadsheets etc as the family one (a basic indestructible type thing that we shared) was needed by my children for online work during school closure. I anticipated some of the bulk buying due to brexit and had booked extra events for this summer to try and up my income to cover costs, but obviously they were all cancelled. I've also managed to diversify slightly into a related area but this involved the purchase of an expensive bit of kit - over about 18-24 months this should pay for itself but right now it's a dent in my profits.
So from April 1st to September 30th, although my business income was higher than at the same point last year (by about £2k) I've only made an average of £45 a week profit. In theory this should significantly increase over the second half of the tax year as I now have the materials and equipment and more of the income from sales/work will be profit, but this only works if people carry on buying from me at the rate they have been - and that isn't certain at all, as job losses start and forlough ends etc. What I make and sell is very much a nice-to-have not an essential!
I claimed the first SEISS when things looked very uncertain for my business at the start of May and got £1300, so the second one would be about £1100. I don't know whether to claim it or not 
WWYD?