Forecasting DA increases after merging domains?

[rl_uk]

Hi all, I wondered if anyone had any suggestions for forecasting DA changes after merging two domains.

The context is that we have two sites and there is argument to combine them into one. To cut a long story short, one of the considerations is how much DA might increase if we migrated one domain into the other.

Domain 1 has a DA in the 30s. Domain 2 (which we'd redirect) has a DA in the late 20s. Around 90% of the LRDs are 'incremental'.

Surely there is a way to forecast what the increase in DA would be if we decided to combine? I haven't found anything online...

[SEOTOOLSHERO04]

You don't need to force due to http://getfast.ca/ is not making enough backlinks.

[Gamessite]

nearly same case as mine, m also trying  to forecast DA changes of https://smmstore.uk.

[Robert012]

How can I increase the DA of my site, which is 6 months old: www.fantaserye.su

[vidi34234]

I am seeing many brand new sites DA increasing above 40+ without just few month. wondering i can also increase the DA for the site https://www.etechnoblogs.com as well as http://weblinks.aircus.com/blog