If the husband is totally impotent and unable to penetrate, then his wife has the right to seek divorce through the Haakim Al-Sharee'ah who is the Marji' of Taqleed who gives the husband one year to treat himself. After one year, if husband is still unable to penetrate, then the Marje' of Taqleed issues an order of Faskh which mean nullifying the marriage.
It is your decision whether or not to remarry. Now that your husband has passed on, I am sure he would want you to be happy and more secure for the rest of your life.
However, possibly you are still going through the mourning process and aren't ready; maybe if you meet the right person and it is the right time, you will feel inside that it is the right time. Maybe the way you are seeing things right now suggests that it isn't quite the right time.
Religiously speaking, there is no benefit to putting extra restrictions on ourselves or making ourselves suffer more than our circumstances require. Sometimes people do this with a sense that Allah rewards difficulty. However, life is difficult enough without putting extra restrictions on ourselves!
People in jannah can be with whoever they want, whether or not they remarry.
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