Remortgage if property value has increased - Advice please

Hey all, we paid 420 for our property about 2 years ago. Neighbors has just sold for 510 Ours would also have more done to it, solar system etc. So we may have about 100,000 increase in value.

We are on a 5 year fixed. Do we have any options. Mortgage payments are Approx 1,300 per month at the moment. Fairly clueless with all of this. Are we stuck until the 5 years are up before we can negotiate with our bank or do we have options now to make ourselves a bit more secure financially.

I would very much appreciate any advice. Thank you.