Where do I go next in terms of power? I was thinking of an intercooler upgrade. What do you guys think?

Decent, free-flowing exhaust, and possibly a mild turbo upgrade.
take power up to ~180KW ATW
Stock cooler should be able to support that power quite well, but an upgrade to something like the Process West units, is not a bad thing for extra cooling capacity

throw the TMIC into the bin.

Go FMIC.

Easy kw there.

Turbo upgrade from VF38 (=16T comp wheel)-->TD04HLA-19T-8.5 -->VF36(twin scrolled VF30)or VF37(twin scrolled BB VF34)
As you have an auto more inclined to go for compressor wheel upgrade only (ie 46.5/60mm) the turbine wheel has a 52mm inducer so the upgrade is just on the 15% rule..
If your TMIC has reached it thermal max (that can be weather temp dependent)then upgrading to a larger TMIC or FMIC will make a difference to your present tune.If not maxed then IC upgrade will make little difference.The benefit of IC upgrade is downstream with improved turbo,exhaust etc and want to run a more agressive tune.The larger IC will be able to handle a greater thermal load the FMIC > TMIC.
The other option to IC upgrade is to consider a water injection kit.

I have all my turbo work done by MTQ Australia in Adelaide.They do have a workshop in Sydney.
The existing compressor wheel on the IHI VF38 has the same trim as a TD04-16T wheel 43.4/56mm.
Upgrade to IHI 46.5/60mm compressor wheel.The same wheel as IHI VF30/34/35/36/37 turbo.
The disparity between the compressor wheel exducer ie 60mm should not exceed approx 15% of the turbine wheel inducer VF38 is 52mm (52+7.8=59.8mm).The VF30/34/35/36/37 have 52mm inducer turbines.
Reliabilty and longevity should not be compromised. This is a non BB or a thrust/sleeve bearing turbo.
If you upgrade the compressor wheel then it is wise to rebuild the turbo at the same time.
A rebuild kit for the VF38 for $90 delivered.

Regarding costing:
Remove turbo and put it back in -> DIY or approx $300 with Subaru.
Compressor wheel approx $100
Rebuild kit $90
MTQ to rebuild and high flow compressor housing and VSR new wheel $200
The 2K price?
The FMIC has an increased volute from the turbo to the Throttle Body. This has to be charged up to boost approx max delay is .25 sec.This can be reduced if using smaller intercooler or custom piping (usually shorter piping than found in pre-made kits)
A TMIC upgrade is the simpler install and cost effective option since you are not upgrading the turbo.
If there is issues with heat soak in summer you can always add waterspray kit.
Alternate to the TMIC upgrade is a  water injection kit.

Your present tune is integrated with your existing exhaust back pressure.
Full turbo back exhaust will signficantly reduced the back pressure.
A retune would be essential to optimize this.