Looking for input on portfolio construction

Hi everyone,

I'm looking for advice on how to build a balanced portfolio in a taxed account of only ETFs for the long term (ex: 20-40 years).

I'm considering:

VTI: 50% for broad US market exposure VXSUS: 20% for international exposure QQQ: 20% for more aggressive growth

Other 10% for either a sector specific ETF (biotech/oil) or bonds.

For reference, in a non-taxed account I am thinking of doing:

50% S&P500 for broader US market 25% SCHD for dividend growth 25% FTEC for concentrated tech growth

I'd love to get input as to whether this seems like a balanced portfolio or if there are any large gaps people identify. Also would love some input if I'm thinking about my non-taxed (Roth) the right way as well.