Cut back on 401k contributions? (126k @ 30 years old)

Currently have 126k in my Roth 401k and another 15k in my Roth IRA. I’m contributing 8% of my pay in the 401k plus 3% employer match and 200 monthly into the IRA.

Family of 3 and saving money monthly in a HYSA.

We’re looking to get a larger house in spring and expect to nearly double our current mortgage of $1,400.

What thoughts, advice, experiences do you have on cutting contributions down to have more money in our pockets monthly for the higher mortgage?

I estimated nearly $3 million by age 65 assuming 8% returns over the next 35 years if I continue to contribute 3% at current salary with my companies 3% match.