Might your family be able to help you with a downsizing move (helping you to dealing with decluttering, paperwork, viewings of a new property etc), if you don't feel up to doing it yourself? Or is your current property actually suitable to see you into old age: not too big, located near essential services, low maintenance building and garden, warm, low running costs, adaptable for reduced mobility and so on?
If it isn't, my worry would be that if you took out an equity release plan now, but in a few years really did need to move, you might find that you could no longer afford a more suitable property because too much of the equity had been eaten up the equity release and the cumulative interest. Your only option then might be to sell up altogether and move into rented - not necessarily a bad move, as it can be better to rent than buy a sheltered flat, for example, but it's always better to have choices.
And in any case, the older you get, the more daunting a move can seem (my parents left it too late, and were trapped in a totally unsuitable, huge, high-maintenance, wheelchair-unfriendly, isolated house).